Effect of differences in regulated and unregulated factors in soil arable and subsoil layers on yield of winter wheat and winter oil seed rape
2011
Lapins, D., Latvia Univ. of Agriculture, Jelgava (Latvia) | Kopmanis, J., Latvia Univ. of Agriculture, Jelgava (Latvia) | Plume, A., Latvia Univ. of Agriculture, Jelgava (Latvia) | Gmizo, J., Latvia Univ. of Agriculture, Jelgava (Latvia)
The objective of the study is to improve the basis for differentiation cartograms of growing technologies for winter wheat and winter oil seed rape. Growing of winter oil seed rape in season 2008/2009 followed by winter wheat in 2009/2010 in 48 observation points in soil arable layer and in subsoil layer was determined: organic matter content, soil texture class, content of phosphorus and potassium, soil reaction. The crop roots mass and the length of the main root were determined in autumn after crop germination and in spring after renewal of vegetation. It was found that the root mass of winter oil seed rape and winter wheat in spring is the most significant parameter what determines formation of the oil seed rape yield. The mass of oil seed rape and winter wheat roots in spring had a significant positive effect on the soil density index in the subsoil layer. A significant positive effect on the winter wheat grain yield was shown also by the length of the main root in the autumn and the total root mass in spring. Increased content of potassium in both soil arable layers and in the subsoil layer has a significant positive effect on the winter wheat grain yield.
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